Hot-blast air-feeding center tube.



No. 758,231. PATENTED AEREE, 1904.

E. A. GULTEE.A E HUT ELAST AIE EEEDING CENTER TUBE.

APPLICATION FILED JAN. 4, 1904.

UNITED- STATES Patented April 2c, 1904.

'PATENT OFFICE;

HOT-BLAST AIR-FEEDING CENTER TUBE.

SPECIFICATION forming part of Letters Patent No. 758,237, dated April 26, 1904.

Application led January 4, 1904.

To all whom, it may concern:

Be it known that I, RICHARD A. CULTER, a

citizen of the United States, residing at 1005 Hamilton street, Peoria, in the county ofPeoria and State of Illinois, have invented certain new and useful Improvements in Hot-Blast Air- Feeding Center Tubes; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In stoves in which a hot air-blast feed is used the air is fed to the combustion-chamber by a register controlled downdraft center tube depending from the top plate of the stove and terminates a short distance above the fire-pot and the fuel is fed through au opening in the top down outside of the hotblast air-feeding tube. A liftcover closes the feed-opening, andthe quick closingof the register in the tube is often followed by an explosion or what is known as pufiing, which is caused by the unconsumed gas and smoke in the combustion-chamber. The purpose of my improvement is to prevent this pufling and explosion by maintaining a perpetual feeding of air through a group or groups of perforations in the lift-cover into the combustion-chamber outside of the downdrafttube, whereby the combustion of the smoke and gases is rendered so complete that explosions will be prevented.

The accompanying drawings illustrate my improvement in Figure l, which is a vertical section of a'stove with a hot-blast air-feeding center tube; and Fig. 2 shows in perspective the top of the stove,` the registered inlet for the center downdraft air-feeding tube and the lift-cover for feeding the coal having panels of perforated tin for feeding a'ir into the combustion-chamber outside of the hotblast air-feeding tube. Fig. 3 shows a horizontal section of thel perforated lift-cover.

The body of the stove is of sheet-steel supported by a suitable base and closed at the top by a plate which has the usual collar for the smoke-pipe. Centrally in the top plate 1 is suitably fitted an air-feeding tube 2, which terminates above the fire-pot and delivers a hot blast directly upon the fuel, so as to fan Serial No. 187,644. (Ilo model.) l

Yit to a name and to consume the ignited gases.

The cold air entering at the top of this center downdraftltube is caused to be highly heated in its down passage and becomes a hot blast as it is delivered directly upon the bed. of coals, uniting with and burning the gases and oxygen. A register-cap 3, fixed on lthe top plate, covers and controls the inletair-feeding tube,so that there is a constant feeding of air through the perforations of the liftcover which serves to consume the excess of gases and smoke in the combustion-chamber,

and thereby prevent explosion and puffing.

In connection with this constant air-feed there is a controllable feeding of air through the center air-feeding tube to maintain a bright re.' Theperforated tin forms a pair of panels in the lift-cover and are suitably secured on its under side, and without these perforations should the register in the tube be closed suddenly with a hot lire it is very apt to produce an explosion. l

The stove has the usual draft-'valves 6 in the ash-pit; but these base-valves are only opened to admit air to maintain the fire after the gases and smoke are consumed and the coals are in an incandescent condition and in the nature of coke, and when the base-valves are open the air-inlet end of the downdraft airfeeding tube is closed by its cap-register. In supplying air to the fire through the grate at Vthe same time there is a perpetual feeding of air directly into the combustion-chamber from Ythe perforations in the top-lift cover, which not only serves to promote combustion, but has proved a perfect success as a preventer `of puffing and explosions in the combustionchamber. It is important to note that the vroc and that it is the pressure of this constant down air-feed that p'revents smoke or gas from passing up through the perforations into the room, the atmospheric pressure being at all times active through these perforations.

While I have described and shown the toplift -cover having panels of perforated sheet metal for feeding air constantly into the combustion-chamber, obviously the perforations may be made in panels in the cover itself for the same purpose, and while I prefer to use sheet-tin for the set-in perforated panels obviously the panels may be made of perforated sheet-mica or other suitable material. In

feeding the stove the lower valves should'be" closed.

I claim- 1. Ina heating-stove and in combination, a lire-pot, a grate,a valve-controlled air-feeding tube opening at the top of the Ere-pot and a to this specification in the presence of two subscribing witnesses.

RICHARD A. CULTER.

Witnesses:

ALBERT V. CULTER, JAMES C. Fox. 

